Burt,
We sell PVC manual ball valves you can install which allow you to shut off the water supply to the sprinkler system.
You can also choose an electric valve and install it close to the water supply source and run the wire connections to the controller master valve connections of the controller. The master valve will then turn on everytime the sprinkler system is set to run and turn off when the system is set to go off.
Installing a master valve is a great idea since it prevents water waste (not to mention the mess) if one of your control valves (zone valves) goes out.
Any sprinkler valve will work. I recommend the Rain Bird 100-DV valve. It is found on the following page on our website:
http://www.sprinklerwarehouse.com/shop3/ValvesRain_Bird.html
I hope this answers your question, if not just reply and keep asking!
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Edited by - SprinklerWarehouse Irrigator on Dec 18 2001 12:09:08 AM